[Tux3] Patch: Example ddlink control interface

[Daniel Phillips]

Here is an example control interface for Tux3, using ddlink as improved
by Hirofumi.  It does not do anything yet.  This patch is just intended
to show how the interface works and what kernel files it affects.  Even
though ddlink is probably going to be very useful and important to us
when we get to snapshots and replication, I do not think we will include
it in the initial kernel submission for review, to avoid getting tied up
in long discussions of favoriate kernel/userspace interface mechanisms
that would distract from the base functionality of Tux3 as a modern,
functional equivalent of Ext3.

hg diff | diffstat
 b/user/kernel/control.c |   44 ++++++++
 b/user/kernel/ddlink.c  |  248 ++++++++++++++++++++++++++++++++++++++++++++++++
 b/user/kernel/ddlink.h  |   45 ++++++++
 user/kernel/Makefile    |    3
 user/kernel/inode.c     |    6 -
 user/kernel/namei.c     |    6 +
 user/kernel/tux3.h      |    4
 7 files changed, 351 insertions(+), 5 deletions(-)
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